Power Window Control Circuit for Foreign Matter Release
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Solution Overview
Problem
Conventional power window apparatuses lack a function to prevent foreign matter from being trapped between the window glass and the belt molding when the window is opened, leading to increased motor load, potential damage, and erroneous activation of the pinching prevention function, which can cause re-trapping.
Innovation Solution
An open-close member control apparatus with a driving motor, control circuit, manipulation switch, trapping detection section, and pinching detection section that restricts motor power supply to stop trapping during open movement and allows controlled closure to release the foreign matter, preventing re-trapping and motor anomalies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor is operated continuously when foreign matter is trapped between the window glass and belt molding, then the window glass can be driven to open direction, but the motor may suffer damage, produce unusual sound and lower operating speed
Solution Approach 1:
The control circuit performs preliminary detection of trapping conditions before continuous motor operation proceeds. When foreign matter is detected between the window glass and belt molding during open movement, the control circuit interrupts motor operation to prevent damage, allowing the system to take preventive action before the motor suffers damage or performance degradation
2Reliability
If the pinching prevention function is activated when foreign matter is trapped, then the window glass can be driven to close direction to release trapping, but the pinching prevention function may be activated erroneously causing reverse movement and re-trapping
Solution Approach 1:
The control circuit segments the trapping release function into distinct operational modes: when trapping is detected during open movement, the system restricts automatic pinching prevention activation and requires manual user input to drive the window glass to close direction. This segmentation prevents erroneous automatic activation while maintaining the ability to release trapping when needed
Solution Approach 2:
The control circuit uses feedback from the trapping detection to determine whether to activate the pinching prevention function. By monitoring the detection state and motor operation status, the control circuit decides whether automatic pinching prevention should be activated or whether manual user input is required, preventing erroneous activation that would cause re-trapping
3Reliability
If the motor is stopped when trapping is detected during open movement, then motor damage is prevented, but the foreign matter remains trapped and requires manual intervention
Solution Approach 1:
The control circuit enables the window glass to drive to close direction under restricted state when user input is received, allowing the system to release the trapped foreign matter automatically through user-initiated command rather than requiring complete manual intervention. This self-service mechanism maintains motor protection while improving operational efficiency
Data Source
AI summary
An open-close member control apparatus has a function to release a foreign matter pinched to an open-close member. The open-close member is either (i) driven only while a manipulation switch is manipulated or (ii) driven continuously once the manipulation switch is manipulated to a specified position regardless of whether the manipulation is then released. When trapping of a foreign matter is detected under an open movement of the open-close member to an open direction based on an open command signal from the manipulation switch, an electric power supply to a motor is restricted to stop a progress of the trapping. When receiving a close command signal from the manipulation switch after restricting the electric power supply, the electric power is supplied to the motor to drive the open-close member to a close direction under a restricted state of a predetermined operation.